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USB: Don't fail USB3 probe on missing legacy PCI IRQ.
Intel has a PCI USB xhci host controller on a new platform. It doesn't have a line IRQ definition in BIOS. The Linux driver refuses to initialize this controller, but Windows works well because it only depends on MSI. Actually, Linux also can work for MSI. This patch avoids the line IRQ checking for USB3 HCDs in usb core PCI probe. It allows the xHCI driver to try to enable MSI or MSI-X first. It will fail the probe if MSI enabling failed and there's no legacy PCI IRQ. This patch should be backported to kernels as old as 2.6.32. Signed-off-by: Alex Shi <alex.shi@intel.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable@vger.kernel.org
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3 changed files with 13 additions and 3 deletions
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@ -187,7 +187,10 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
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return -ENODEV;
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dev->current_state = PCI_D0;
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if (!dev->irq) {
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/* The xHCI driver supports MSI and MSI-X,
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* so don't fail if the BIOS doesn't provide a legacy IRQ.
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*/
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if (!dev->irq && (driver->flags & HCD_MASK) != HCD_USB3) {
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dev_err(&dev->dev,
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"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
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pci_name(dev));
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@ -2447,8 +2447,10 @@ int usb_add_hcd(struct usb_hcd *hcd,
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&& device_can_wakeup(&hcd->self.root_hub->dev))
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dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
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/* enable irqs just before we start the controller */
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if (usb_hcd_is_primary_hcd(hcd)) {
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/* enable irqs just before we start the controller,
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* if the BIOS provides legacy PCI irqs.
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*/
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if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
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retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
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if (retval)
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goto err_request_irq;
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@ -352,6 +352,11 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd)
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/* hcd->irq is -1, we have MSI */
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return 0;
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if (!pdev->irq) {
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xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n");
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return -EINVAL;
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}
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/* fall back to legacy interrupt*/
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ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED,
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hcd->irq_descr, hcd);
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